Objective:

To determine the optimum Alum dosage for water or waste water treatment by Jar test.

Apparatus used:

Nephelometer, Nephelometer tube, Pipette, Beaker, Stirrer and Measuring cylinder etc.

 Take 500ml of water sample in six beakers using measuring cylinder.

 Add different dosages of Alum solution to the six beakers with one as blank.

Squeeze the pipette bulb and dip the

pipette into the Alum solution

Press the up arrow on the bulb

to take the liquid up into the pipette

Press the down arrow on the bulb

to release Alum solution

0ml

 Stir the mixture thoroughly at 100rpm for one minute and at 30rpm for 15-20 minutes.

Place the beaker in the appropriate positon

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0 0

0 0 0

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Allow the sample to settle down for 2 to 3 minutes without disturbance

 Take the Nephelometer tube fill it with the sample in the beaker.

 Place the sample cell with distilled water in the Nephelometer. Set readings to zero by adjusting coarse and fine knob.

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 Now place 100 NTU calibration standard in the sample holder of Nephelometer. Adjust the calibrate knob to set the readings to 100.

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 Measure the Turbidity of samples by placing sample tube in the Nephelometer.

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